<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>



        let str = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
        // console.log(shu)
        let cites = [
            { py: 'beijing', name: '北京' },
            { py: 'alishan', name: '阿里山' },
            { py: 'beidaihe', name: '北戴河' },
            { py: 'shijiazhuang', name: '石家庄' }
        ]


        let shu = {};
        for (let i = 0; i <= str.length; i++) {
           shu[str[i]]=[];
            // console.log(str)
        }
        // console.log(shu)
        cites.forEach(function(item){
            shu[item.py[0].toUpperCase()].push(item)
        })
        console.log(shu)

        
    </script>
</body>

</html>